
using System.Security.Cryptography;
using System.Text;
using System;

namespace Development.Tools
{
	public static class MD5Common
	  {
	      /// <summary>
	      /// 返回指定字符串的Md5
	      /// </summary>
	      /// <param name="strInput">指定字符串</param>
	      /// <returns>返回字符串的Md5</returns>
	      public static string GetMd5Hash(string strInput)
	      {
	          // Create a new instance of the MD5CryptoServiceProvider object.
	          MD5 md5Hasher = MD5.Create();
	
	          // Convert the input string to a byte array and compute the hash.
	          byte[] btData = md5Hasher.ComputeHash(Encoding.Default.GetBytes(strInput));
	
	          // Create a new Stringbuilder to collect the bytes
	          // and create a string.
	          StringBuilder sBuilder = new StringBuilder();
	
	          // Loop through each byte of the hashed data
	          // and format each one as a hexadecimal string.
	          for (int i = 0; i < btData.Length; i++)
	          {
	              sBuilder.Append(btData[i].ToString("x2"));
	          }
	
	          // Return the hexadecimal string.
	          return sBuilder.ToString();
	      }
	
	      /// <summary>
	      /// 检查一个普通字符串的Md5，与传递的Md5字符串是否相同
	      /// </summary>
	      /// <param name="strInput">普通字符串</param>
	      /// <param name="strHash">Md5字符串</param>
	      /// <returns>返回是否相同</returns>
	      public static bool VerifyMd5Hash(string strInput, string strHash)
	      {
	          // Hash the input.
	          string strhashOfInput = GetMd5Hash(strInput);
	
	          // Create a StringComparer an comare the hashes.
	          StringComparer comparer = StringComparer.OrdinalIgnoreCase;
	
	          if (0 == comparer.Compare(strhashOfInput, strHash))
	          {
	              return true;
	          }
	          else
	          {
	              return false;
	          }
	      }
	
	  }
}